Postnationalism or non-nationalism is the process or trend by which nation states and national identities lose their importance relative to cross-nation and self-organized or supranational and global entities as well as local entities. Although postnationalism is not strictly considered the antonym of nationalism, the two terms and their associated assumptions are antithetic as postnationalism is an internationalistic process. There are several factors that contribute to aspects of postnationalism, including economic, political, and cultural elements. Increasing globalization of economic factors (such as the expansion of international trade with raw materials, manufactured goods, and services, and the importance of multinational corporations and internationalization of financial markets) have shifted emphasis from national economies to global ones.
At the same time, socio-political power is partially transferred from national authorities to supernational entities, such as multinational corporations, the United Nations, the European Union, the North American Free Trade Agreement (NAFTA), and NATO. In addition, media and entertainment industries are becoming increasingly global and facilitate the formation of trends and opinions on a supranational scale. Migration of individuals or groups between countries contributes to the formation of postnational identities and beliefs, even though attachment to citizenship and national identities often remains important.